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Plastic Manufacturing and Assembly

Manufacturing & Assembly


Plastic Injection Moulding Process

The first step in the injection moulding process is to feed plastic pellets into a hopper, which then feeds the pellets into a barrel. The barrel is heated and contains a reciprocating screw or a ram injector.

The reciprocating screw crushes the pellets, making it easier for the plastic to be liquefied. Toward the front of the barrel, the reciprocating screw propels the liquefied plastic forward, thereby injecting the plastic through a nozzle and into the empty mould.

Unlike the barrel, the mould is kept cool to harden the plastic into the correct shape. The mould plates are held closed by a large plate (referred to as a movable platen).

The movable platen is attached to a hydraulic piston, which puts pressure on the mould. Clamping the mould shut prevents plastic from leaking out, which would create defozrmities in the finished pieces.

Plastic Extrusion Moulding Process

Extrusion moulding is another method of manufacturing plastic components. Extrusion moulding is very similar to injection moulding and is used to make pipes, tubes, straws, hoses and other hollow pieces.

Plastic resin is fed into a barrel where it is liquefied. A rotating screw propels the liquefied plastic into a mould, which contains a tube-shaped orifice. The size and shape of the tube determines the size and shape of the plastic piece.

The liquefied plastic then cools and is fed through an extruder, which flattens the plastic and forms the piece into its final shape.


Assembly of moulded plastic parts is an intricate part of the total moulding solution Classic Closures provides. We go beyond viewing assembly as secondary, and instead will work to integrate plastic part assembly into the total moulded part process whenever possible.

Part of our approach is to provide a seamless moulding process, we consider how the use of multiple-cell molding and assembly, 2-shot molding, insert molding, heat staking, ultrasonic welding, riveting, printing, and more can be coordinated with the aid of computer-monitored and precise robotic transfer and assembly. Our goal: to reduce costs while increasing assembly speed, assembly accuracy, and assembly volume of your multi-faceted injection molded part.

Classic Closures assembly operations include:

Heat Staking

Over Moulding

Insert Moulding

2-Shot Moulding

Ultrasonic Welding



Adhesive Assembly

Hand Assembly

Manufacturing & Assembly: Services
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